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The cause of 'weak-link' grain boundary behaviour in polycrystalline Bi₂Sr₂CaCu₂O₈ and Bi₂Sr₂Ca₂Cu₃O₁₀ superconductors [dataset] Open Access

The detrimental effects of grain boundaries have long been considered responsible for the low critical current densities in high temperature superconductors. In this paper, we apply the quantitative approach used to identify the cause of the ‘weak-link’ grain boundary behaviour in YBa2Cu3O7 (Wang et al 2017 Supercond. Sci Technol. 30 104001), to the Bi2Sr2CaCu2O8 and Bi2Sr2Ca2Cu3O10 materials that we have fabricated. Magnetic and transport measurements are used to characterise the grain and grain boundary properties of micro- and nanocrystalline materials. Magnetisation measurements on all nanocrystalline materials show non-Bean-like behaviour and are consistent with surface pinning. Bi2Sr2CaCu2O8: our microcrystalline material has very low grain boundary resistivity which is similar to that of the grains such that (assuming a grain boundary thickness (d) of 1 nm) equivalent to an areal resistivity of the transport values are consistent with well-connected grains and very weak grain boundary pinning. However, unlike low temperature superconductors (LTS) in which decreasing grain size increases the pinning along the grain boundary channels, any increase in pinning produced by making the grains in our Bi2Sr2CaCu2O8 materials nanocrystalline was completely offset by a decrease in the depairing current density of the grain boundaries caused by their high resistivity. We suggest a different approach to increasing from that used in LTS materials, namely incorporating additional strong grain and grain boundary pinning sites in microcrystalline materials to produce high values. Bi2Sr2Ca2Cu3O10: both our micro- and nanocrystalline samples have of at least 103. This causes strong suppression of across the grain boundaries, which explains the low transport values we find experimentally. Our calculations show that low in untextured polycrystalline Bi2Sr2Ca2Cu3O10 material is to be expected and the significant effort in the community in texturing samples and removing grain boundaries altogether is well-founded.

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Resource type

Dataset

Contributors

Creator: Wang, Guanmei ¹
Creator: Raine, Mark J. ¹
Creator: Hampshire, Damian ¹
Contact person: Hampshire, Damian ¹

¹ Durham University, UK

Funder

Engineering and Physical Sciences Research Council

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Subject

Superconductors

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Language

Cited in

doi:10.1088/1361-6668/aaa1b8

Identifier

ark:/32150/r1nz805z69x
doi:10.15128/r1nz805z69x

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All rights reserved All rights reserved

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Durham University

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S. Palucha

Date Uploaded

20 December 2017, 22:12:41

Date Modified

23 July 2026, 15:07:43

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